A good example is this 12 seconds Canon HG10 AVCHD file: http://file.meyersproduction.com/hg10/raw%20files.zip If you convert it to Mpeg2, it will display 24 seconds: ffmpeg -i canon-hg10-avchd.mts -acodec copy -vcodec mpeg2video -qscale 1 -qmin 1 canon-hg10-mpeg.m2t Kind regards, Jean-Michel